We must express how important packaging the heads and cylinders are. They are aluminum and are very delicate. We would rather see them over packed than under packed. Try to wrap each piece in bubble wrap at least 3-4 inches thick and packing foam peanuts. Also put at cardboard dividers around all sides of the box and between the heads and cylinders. U.P.S. the United Parcel Service and FedEx are very rough when handling packages. This way when they are packed properly we don’t have to wait on processing claims with the delivery companies. And you will receive your merchandise back in good condition and in a timely manner. Thank you for your cooperation and we look forward to doing business with you.